Edtjabd puttmann aistd josef fliegel



lllll/E/VTORS (No Model,)

' E. PUTTMANN &; J. FLIEGEL.

METHOD OF ENAMELING METALLIO ROOFING PLATES.

NITED STATES PATENT EDUARD PUTTMANN AND JOSEF FLIEGEL, OF HAGEN, PRUSSIA, GERMANY.

METHOD OF ENAMELING METALLIC ROOFING-PLATES.

SPECIFICATION forming part of Letters Patent. No. 336,157, dated February 16, 1886.

Application tiled December 10, 1885. Serial No. 185,828.

(No specimens.)

Patented in Luxcmhnrg' June 24,1985, No. 548, and

in Belgium June 30, 1885, No. 69,350.

To LLZZ 1012,0712 it may concern:

Beitknown that W6,EDUARD PUTTMANNand J osEF FLIEGEL, of Hagen, Kingdom of Prus sia, and Empire of Germany, have invented certain new and useful Improvements in Methods of Enameling Metallic Roofing- Plates,

(which have been patented to us in Belgium,

, No. 69,350, dated June 30, 1885, and Luxembur No. 548, dated June 24, 1885,) of which IO which the following is a specification.

This invention relates to an improved process of manufacturing roofing-plates of sheetiron or sheetsteel, to be used for covering roofs, towers, walls, &c.; and the invention consists of a process of enameling sheet-metal roofing-plates by dipping said plates into a liquid enamel, removing the surplus enamel by centrifugal action, baking the plates in muffles, and finally cooling the same.

In the accompanying drawings, Figure 1 represents a horizontal section on line war, Fig. 2, of a baking-oven to be used with our improved process of enameling sheet-metal roofing-plates. Fig. 2 is a vertical longitudinal section on line y 3 Fig. 3; and Fig. 3 is a vertical transverse section on line 2 z, Fig. 1.

Similar letters of reference indicate corresponding parts.

In carrying out our invention, thin plates 3o ofiron, steel, or other suitable metal are used, which may be pressed into corrugated form, so as to increase the resistance of the same. The plates are dipped into a liquid enamel, which is composed of the following ingredicuts: Fifty-seven parts of silicic acid, twentyfour parts of carbonate of soda, ten parts of calcium, one and one-fourth part of nitrate of soda, six and one-fourth part of borate of soda, and one and one-fourth part of stannate 0 of soda.

The ingredients are mixed and melted in an open-hearth furnace, and ground when dry into a powder, and then mixed with ten per cent. of silicate of alumina, one tenth per cent.

5 of calcined borax, and water, so as to form a thin paste.

\Vhen it is desired to color the plates, the colors usually employed for coloring glass are added to the enamel.

The dipping of the sheet-metal plates into the enamel is effected by mechanical means in such a manner that the submerging of the same takes place quickly while they are slowly taken out of the liquid enamel. It is veryimportant for the process of enameling that the plates be covered with a thin coat of enamel,

which is to be as uniform as possible. The plates are next mounted in a suit-able frame and placed in a centrifugal machine, so as to be rotated first in one direction and then in the other direction. By centrifugal action the surplus enamel is removed from the plates and the enamel distributed uniformly over the sur face of the same. The enameled rooti rig-plates are then placed into a baking-oven (shown in the drawings) that is composed of three or four compartments 0r mnfiics, which are separated by sliding partitions. The first compartment, to, is the drying or warming muffle, in which the plates or tiles are dried. They are then removed into the second compartment, b, which is provided with micacovered sighttubes, so that the progress of the baking operation can be observed. The roofing-plates are then moved into the third compartment, 0, for tempering, and finally into the fourth compartment, (Z, which serves for cooling the plates or tiles.

The furnace is heated by gas generated in a separate furnace, the heating-gases entering the furnace at G and the air at L, as shown in Fig. 3, in addition to which several additional air channels or inlets L may be applied, as shown in Fig. 1.

A O in Fig. 3 represents the exit-flue, and B the cleaning-flue.

The course of the gases of combustion isindicated in the drawings by arrows.

The enameled plates are placed on trucks and passed successively through the different compartments or mufiles of the baking-oven, which are situated one adjoining the other, so that the roofing-plates are baked in a quicker and more effective manner than by the ovens heretofore in use, while by the tempering of the plates in the third muiile a more durable enamel is obtained, which is an essential fea ture for roofing-plates. The consecutive arrangement of the muffles produces, furthermore, a considerable saving in fuel, so that the cost of the roofing-plates is reduced.

The enameled roofing-plates are bad confacturingenameled sheet-metal roofing-plates, which consists of the following successive steps: first, dipping the sheet-metal platesintoliquid enamel; second, removing the surplus enamel by centrifugal action; third, baking the plates; fourth, tempering the same, and, finally, cooling the same, substantially as set forth.

In testimony that we claim the foregoing as our invention we have signed our names in presence of two subscribing witness s.

EDUARD PUTTMANN. JOSEF FLIEGEL.

Witnesses:

GEO. KooH, Ron. I. SOHOENLE. 

